Mathematics
Classify the following angles as acute, obtuse, right, straight or reflex:
(a) 35° (b) 90° (c) 125° (d) 180° (e) 280°
Lines & Angles
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Answer
Recall: an acute angle is less than 90°, a right angle is exactly 90°, an obtuse angle is between 90° and 180°, a straight angle is exactly 180°, and a reflex angle is between 180° and 360°.
(a) 35° → Acute angle (since 35° < 90°)
(b) 90° → Right angle
(c) 125° → Obtuse angle (since 90° < 125° < 180°)
(d) 180° → Straight angle
(e) 280° → Reflex angle (since 180° < 280° < 360°)
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